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On 17 May 2022, the Portuguese Competition Authority (AdC) initiated administrative offence proceedings against Google for abuse of its dominant position in the open display advertising market. Previously, the AdC received a complaint against Google's anti-competitive practices which led to the analysis of the affected markets and interviewing of relevant economic operators. Specifically, the AdC investigated the online advertising market to discover whether Google engaged in self-preferencing behaviours by using information not accessible to competitors during online advertisement auctions, leading to outcomes in Google's favour.
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